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Cambridge IGCSE Physics · 0625

Chapter 6: Space physics — Part 3

Topic 6.2.1 · The Sun as a star

What the Sun is

The Sun is a star of medium size, consisting mostly of hydrogen and helium.

It radiates most of its energy in the infrared, visible and ultraviolet regions of the electromagnetic spectrum.

How a stable star is powered

Stars are powered by nuclear reactions that release energy. In stable stars those reactions are the fusion of hydrogen into helium.

The Sun as a medium-sized star of hydrogen and helium, radiating infrared, visible and ultraviolet, with fusion of hydrogen to helium in the core of a stable star.
Diagram 1: The Sun as a medium-sized star of hydrogen and helium, radiating infrared, visible and ultraviolet, with fusion of hydrogen to helium in the core of a stable star.

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